An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be Option A: 100 W Option B: 75 W Option C: 50 W Option D: 25 W

Answer Correct option: D 25 W

Given that

An electric bulb is rated 220 V and 100 W

Find out

The power consumed when it is operated on 110 V

Solution

We know the formula

P=V2/R

100=(220)2/ R
R= (220)2/100
= 484O0/100 0hm

=484Ω
Now, the bulb is operated at 110 V, the power consumed will be

P=V2/R

P=(110)2/ 484

=12100/484

= 25 W

Answer

Hence the power consumed is 25 W when the bulb is operated at 110 V

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